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antibody.go
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antibody.go
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package antibody
import (
"bufio"
"io"
"os"
"strings"
"sync"
"github.com/bradfitz/slice"
"github.com/caarlos0/gohome"
"github.com/akatrevorjay/antibody/bundle"
"github.com/op/go-logging"
)
var log = logging.MustGetLogger("antibody")
// Antibody the main thing
type Antibody struct {
r io.Reader
Home string
}
// Result is a pipeline element messenger object
type Result struct {
idx int
line string
err error
}
// New creates a new Antibody instance with the given parameters
func New(home string, r io.Reader) *Antibody {
return &Antibody{
r: r,
Home: home,
}
}
// Bundle processes all given lines and returns the shell content to execute
func (a *Antibody) Bundle() (result string, err error) {
file := a.r
inputLines := make(chan Result)
results := make(chan Result)
// I think we need a wait group, not sure.
wg := new(sync.WaitGroup)
// workers
for w := 1; w <= 8; w++ {
wg.Add(1)
go func() {
// Decreasing internal counter for wait-group as soon as goroutine finishes
defer wg.Done()
for res := range inputLines {
log.Debugf("Bundling: %s", res.line)
res.line = strings.TrimSpace(res.line)
if res.line == "" || res.line[0] == '#' {
continue
}
val, err := bundle.New(a.Home, res.line).Get()
res.line = val
res.err = err
if err != nil {
log.Errorf("Error processing line (%s): %s", err, res.line)
}
results <- res
}
}()
}
// source
go func() {
log.Debugf("Reading bundles")
scan := bufio.NewScanner(file)
idx := 0
for scan.Scan() {
line := scan.Text()
line = strings.TrimSpace(line)
inputLines <- Result{idx, line, nil}
idx++
}
err := scan.Err()
if err != nil {
log.Fatalf("Error reading bundles: %s", err)
}
close(inputLines)
log.Debugf("Done reading bundles")
}()
// waiter
go func() {
wg.Wait()
close(results)
}()
// collect
var allResults []Result
for res := range results {
allResults = append(allResults, res)
}
// sort by original idx
slice.Sort(allResults[:], func(i, j int) bool {
return allResults[i].idx < allResults[j].idx
})
// get values
var sources []string
for _, res := range allResults {
sources = append(sources, res.line)
// Does Go have chained exceptions? Course not. Oh well.
if res.err != nil {
err = res.err
}
}
// coallesce
return strings.Join(sources, "\n"), err
}
// Home finds the right home folder to use
func Home() string {
home := os.Getenv("ANTIBODY_HOME")
if home == "" {
home = gohome.Cache("antibody")
}
return home
}